blua I hate dehumidifiers, you might as well get an air conditioner, because they both use the same amount of energy! which is shitload. hmmm, indoor mold resistant strains, thats a bit contradictory, as outdoor strains are usually built for mold resistance.
I am guessing you are in a basement? You should go ahead and get it sealed, that will bring down the humidity and give you a lot more options for indoor growing as far as strains go without the high cost of a dehumidifier and the electricity to run it. Plus a de humidifier wont work too well as the room will keep collecting moisture (if its in an unsealed basement) as the dehum gets the air dry, the wet seepage coming through the concrete walls will just keep making the dry air wet again.